View in EDS

Mantle Source and Metasomatic Agent of Olivine Nephelinites: Insights into Olivine Geochemistry, Oxygen Isotopes and Whole-Rock Os Isotopes.

Saved in:
Bibliographic Details
Title: Mantle Source and Metasomatic Agent of Olivine Nephelinites: Insights into Olivine Geochemistry, Oxygen Isotopes and Whole-Rock Os Isotopes.
Authors: Wang, Changhong1 (AUTHOR), Wang, Jie1 (AUTHOR), Velásquez-Ruiz, Felipe2 (AUTHOR), Conticelli, Sandro3 (AUTHOR), Molina, José F4 (AUTHOR), Zhang, Zhaochong1 (AUTHOR), Wang, Yujian1 (AUTHOR), Xie, Qiuhong5 (AUTHOR), Bo, Hongze6 (AUTHOR), Krmíček, Lukáš7 (AUTHOR)
Source: Journal of Petrology. Apr2026, Vol. 67 Issue 4, p1-15. 15p.
Subject Terms: *Metasomatism, *Osmium isotopes, *Geochemistry, *Alkalic igneous rocks, *Oxygen isotopes, *Ultrabasic rocks, *Earth's mantle
Geographic Terms: Qinling Mountains (China), China
Abstract: Nephelinites are a distinctive group of silica-undersaturated, strongly alkaline ultrabasic volcanic rocks that are occasionally associated with carbonatites. Their genesis has been attributed to the melting of a mantle source enriched by either recycled crustal materials or other metasomatic agents. This study investigates olivine nephelinites and constrains their mantle source from the West Qinling orogen, Central China—a locality noted for its unique occurrence of rocks previously classified as kamafugites or melilitites in China. Olivines in these rocks are categorized into Group I mantle xenocrysts (Fo89–92) and Group II magmatic crystals (Fo81–88). In situ δ18O values of the Group II magmatic olivines (5.04 ± 0.25‰; 1σ, n  = 67) are slightly lower than those of Group I mantle xenocrysts (5.26 ± 0.20‰, 1σ, n  = 199). Measured 187Os/188Os ratios for these nephelinites are moderately to highly radiogenic (0.138–0.682), with age-corrected γOs values varying from +6.57 to +409. Magmatic olivines with elevated 100 × Mn/Fe (mean = 1.65), 100 × Ni/Mg (mean = 0.70) and high 100 × Ca/Fe (mean = 2.33) ratios fingerprint a metasomatized mantle peridotite source. Binary mixing indicates that the observed radiogenic Os isotopes can be explained by the incorporation of <30% melts/fluids derived from a subducted oceanic slab. Our findings suggest that mantle metasomatism, driven by recycled oceanic slabs, played a major role in alkaline enrichment observed in the West Qinling magmas and may provide new insights into the crust–mantle interaction. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
FullText Text:
  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 194374367
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Mantle Source and Metasomatic Agent of Olivine Nephelinites: Insights into Olivine Geochemistry, Oxygen Isotopes and Whole-Rock Os Isotopes.
– Name: Author
  Label: Authors
  Group: Au
  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wang%2C+Changhong%22&quot;&gt;Wang, Changhong&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wang%2C+Jie%22&quot;&gt;Wang, Jie&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Vel&#225;squez-Ruiz%2C+Felipe%22&quot;&gt;Vel&#225;squez-Ruiz, Felipe&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Conticelli%2C+Sandro%22&quot;&gt;Conticelli, Sandro&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Molina%2C+Jos&#233;+F%22&quot;&gt;Molina, Jos&#233; F&lt;/searchLink&gt;&lt;relatesTo&gt;4&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhang%2C+Zhaochong%22&quot;&gt;Zhang, Zhaochong&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wang%2C+Yujian%22&quot;&gt;Wang, Yujian&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Xie%2C+Qiuhong%22&quot;&gt;Xie, Qiuhong&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Bo%2C+Hongze%22&quot;&gt;Bo, Hongze&lt;/searchLink&gt;&lt;relatesTo&gt;6&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Krm&#237;ček%2C+Luk&#225;š%22&quot;&gt;Krm&#237;ček, Luk&#225;š&lt;/searchLink&gt;&lt;relatesTo&gt;7&lt;/relatesTo&gt; (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Journal+of+Petrology%22&quot;&gt;Journal of Petrology&lt;/searchLink&gt;. Apr2026, Vol. 67 Issue 4, p1-15. 15p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Metasomatism%22&quot;&gt;Metasomatism&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Osmium+isotopes%22&quot;&gt;Osmium isotopes&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Geochemistry%22&quot;&gt;Geochemistry&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Alkalic+igneous+rocks%22&quot;&gt;Alkalic igneous rocks&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Oxygen+isotopes%22&quot;&gt;Oxygen isotopes&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Ultrabasic+rocks%22&quot;&gt;Ultrabasic rocks&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Earth&#39;s+mantle%22&quot;&gt;Earth&#39;s mantle&lt;/searchLink&gt;
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Qinling+Mountains+%28China%29%22&quot;&gt;Qinling Mountains (China)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22China%22&quot;&gt;China&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Nephelinites are a distinctive group of silica-undersaturated, strongly alkaline ultrabasic volcanic rocks that are occasionally associated with carbonatites. Their genesis has been attributed to the melting of a mantle source enriched by either recycled crustal materials or other metasomatic agents. This study investigates olivine nephelinites and constrains their mantle source from the West Qinling orogen, Central China—a locality noted for its unique occurrence of rocks previously classified as kamafugites or melilitites in China. Olivines in these rocks are categorized into Group I mantle xenocrysts (Fo89–92) and Group II magmatic crystals (Fo81–88). In situ δ18O values of the Group II magmatic olivines (5.04 &#177; 0.25‰; 1σ, n  = 67) are slightly lower than those of Group I mantle xenocrysts (5.26 &#177; 0.20‰, 1σ, n  = 199). Measured 187Os/188Os ratios for these nephelinites are moderately to highly radiogenic (0.138–0.682), with age-corrected γOs values varying from +6.57 to +409. Magmatic olivines with elevated 100 &#215; Mn/Fe (mean = 1.65), 100 &#215; Ni/Mg (mean = 0.70) and high 100 &#215; Ca/Fe (mean = 2.33) ratios fingerprint a metasomatized mantle peridotite source. Binary mixing indicates that the observed radiogenic Os isotopes can be explained by the incorporation of &lt;30% melts/fluids derived from a subducted oceanic slab. Our findings suggest that mantle metasomatism, driven by recycled oceanic slabs, played a major role in alkaline enrichment observed in the West Qinling magmas and may provide new insights into the crust–mantle interaction. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194374367
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1093/petrology/egag031
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 1
    Subjects:
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Osmium isotopes
        Type: general
      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Alkalic igneous rocks
        Type: general
      – SubjectFull: Oxygen isotopes
        Type: general
      – SubjectFull: Ultrabasic rocks
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Qinling Mountains (China)
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: Mantle Source and Metasomatic Agent of Olivine Nephelinites: Insights into Olivine Geochemistry, Oxygen Isotopes and Whole-Rock Os Isotopes.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Wang, Changhong
      – PersonEntity:
          Name:
            NameFull: Wang, Jie
      – PersonEntity:
          Name:
            NameFull: Velásquez-Ruiz, Felipe
      – PersonEntity:
          Name:
            NameFull: Conticelli, Sandro
      – PersonEntity:
          Name:
            NameFull: Molina, José F
      – PersonEntity:
          Name:
            NameFull: Zhang, Zhaochong
      – PersonEntity:
          Name:
            NameFull: Wang, Yujian
      – PersonEntity:
          Name:
            NameFull: Xie, Qiuhong
      – PersonEntity:
          Name:
            NameFull: Bo, Hongze
      – PersonEntity:
          Name:
            NameFull: Krmíček, Lukáš
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00223530
          Numbering:
            – Type: volume
              Value: 67
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Journal of Petrology
              Type: main
ResultId 1